Blas Wilfredo Omar Jaime (, 'dog without owner'; February 2, 1934 – September 17, 2026) was one of the few known speakers of Chaná, a Charruan language spoken in Argentina. He was referred to as Tató Oyendén, or custodian of the ancestral memory.
The language, which Blas had learned from his female ancestors, was considered extinct before he was interviewed by linguist José Pedro Viegas Barros. The two men authored the book La Lengua Chaná. Patrimonio Cultural de Entre Ríos, published by the official communications department of the provincial government of Entre Ríos. The department published the book in recognition of "Lanték" (the Chaná language) to support the cultural heritage of the province.
Jaime died on September 17, 2026, at the age of 92, leaving his daughter Evangelina as the next guardian of the language.
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